From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933976AbbCDIuY (ORCPT ); Wed, 4 Mar 2015 03:50:24 -0500 Received: from mailout1.w1.samsung.com ([210.118.77.11]:27282 "EHLO mailout1.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933788AbbCDIuS (ORCPT ); Wed, 4 Mar 2015 03:50:18 -0500 X-AuditID: cbfec7f4-b7f126d000001e9a-76-54f6c6b62a3f Message-id: <54F6C746.606@samsung.com> Date: Wed, 04 Mar 2015 09:50:14 +0100 From: Marek Szyprowski User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-version: 1.0 To: Kevin Hilman , Javier Martinez Canillas Cc: Kukjin Kim , Olof Johansson , Krzysztof Kozlowski , Andreas Faerber , linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, tyler.baker@linaro.org, Andrzej Hajda , Inki Dae Subject: Re: [PATCH 1/1] ARM: exynos_defconfig: Disable IOMMU support References: <1424173109-30347-1-git-send-email-javier.martinez@collabora.co.uk> <7hioehu8cn.fsf@linaro.org> In-reply-to: <7hioehu8cn.fsf@linaro.org> Content-type: text/plain; charset=utf-8; format=flowed Content-transfer-encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrNLMWRmVeSWpSXmKPExsVy+t/xa7rbjn0LMZh7XN3i1rpzrBbNm4ot nnZdZLY4+rvA4vULQ4v+x6+ZLZ5ufsxkcXnXHDaLGef3MVmcuv6ZzeLjjnssDtwef59fZ/HY Oesuu8emVZ1sHneu7WHzuHKiidWjb8sqRo/Np6s9Pm+SC+CI4rJJSc3JLEst0rdL4Mq4/vsl c8F5roqJTdtZGxivcHQxcnJICJhIrLq4hhHCFpO4cG89WxcjF4eQwFJGiSWbt7JCOJ8YJb4t vA5UxcHBK6AmMWOeKYjJIqAqcepHPUgvm4ChRNfbLjaQsKhAjMTLh5EgYV4BQYkfk++xgNgi AskSjzdvYAeZyCywk0mi+9lMdpCEsICrxJVLv8CKhARyJboPn2MDsTkFNCSaHk5nArGZBcwk vrw8zAphy0tsXvOWeQKjwCwkO2YhKZuFpGwBI/MqRtHU0uSC4qT0XEO94sTc4tK8dL3k/NxN jJAI+bKDcfExq0OMAhyMSjy8BUnfQoRYE8uKK3MPMUpwMCuJ8O7aBBTiTUmsrEotyo8vKs1J LT7EyMTBKdXAaGsr/uLUiuVf9uZd21Ux/YpdJ3ecaUT63qvXXKKLnZPW3WD/mGl9d9/OOKYf WbG2V7n7q/MrfPfuW/Mj8EJ51kneo4kfqx6/3FXpOPmmVbzK7LUrfBueSV08vVOA6eZZHauC KYcn3mANm2ezxTGpecfucwmWew8fFJxQ9kf0wlnbjc99u168s1ViKc5INNRiLipOBADwmT9p bgIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On 2015-03-03 21:36, Kevin Hilman wrote: > Javier Martinez Canillas writes: > >> Enabling Exynos DRM IOMMU support for Exynos is currently broken and >> causes a BUG on exynos-iommu driver. This was not an issue since the >> options was disabled in exynos_defconfig but after commit 8dcc14f82f06 >> ("drm/exynos: IOMMU support should not be selectable by user"), it is >> selected if EXYNOS_IOMMU is enabled which is in exynos_defconfig. >> >> So a kernel built using exynos_defconfig after the mentioned commit >> fails to boot [0]. Disable IOMMU support in Exynos defconfig until >> things get sorted out. > So some other exynos boards started failing in next-20150303[1], and > appear are DRM failures. > > Interestingly, (re)enabling CONFIG_EXYNOS_IOMMU for these cause things to > work again. Even more intersting, with IOMMU enabled, peach-pi is > > I'm starting to think it's the DRM driver that needs to be disabled > until it actually gets some testing, rathre than disabling IOMMU. Well, this only shows that broken patch has been merged to exynos-drm-next kernel tree. I think that we should keep Exynos DRM enabled and give Exynos DRM developers a chance to fix their stuff and then test their stuff. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland